Implement backpressure handling for queue processing

[RUKAYAT-CODER]

Backpressure prevents queue overwhelm.

Acceptance Criteria:

• Backpressure mechanism implemented
• Rate limiting on queue processing
• Queue depth monitoring
• Alerting on high queue depth

[Nimatstar]

@Nimatstar has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi, am a full Stack developer can I work on this task.
ETA:6hrs

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Nimatstar to this issue.

[drips-wave]

Congratulations, @Nimatstar! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @Nimatstar: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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